The required cylinder is the key component of the hydraulic cylinder, and sometimes the direct acting component of the hydraulic cylinder (when fixing the piston rod or plunger);The cylinder body, end cover and piston (plunger) constitute a sealing chamber for holding pressure oil and acting as a driving load;Therefore, the strength, stiffness and sealing requirements of the cylinder are as follows:

(1) The barrel should have sufficient strength to prevent permanent deformation under long-term rated operating pressure and short-term dynamic test pressure.

(2) The barrel should have sufficient rigidity to prevent bending caused by lateral force imposed by the piston and reacting force during installation.

(3) Reliable seal: The grade of dimensional tolerance and accuracy of geometric tolerance of cylinder inner surface, piston seal and supporting ring should be designed rationally to ensure reliable seal and reduce wear.

(4) The cylinder barrel to be welded should have good weldability to avoid cracking or excessive deformation after welding of flange, cylinder bottom or joint.

The above requirements should be guaranteed by proper selection of barrel material and rational process of manufacturing.

Material selection of hydraulic cylinder barrel:

(1) Generally, the annealed cold-drawn or hot-rolled seamless steel tube is used as the workblank of cylinder barrel. The semi-finished product with honed or accurately machined inner hole is available on the market, which may be cut into seamless steel tubes of the required length. Optional materials include 20#, 35#, 45# steel and 27SiMn alloy steel.

(2) Hydraulic cylinder barrel with operating temperature below -500C must be made of 35# or 45# steel and treated by thermal refining.

(3) The barrel welded with cylinder cover or flange should be made of 35# steel and treated by thermal refining after pre-machining, while the cylinder not welded with other parts should be made of hardened and tempered 45# steel.

Bos-Hyd is a professional manufacturer of hydraulic cylinder with over 23 years experience in china , we have exporte to more than 60 countries in the world,honed tube ,chrome rod,chrome bar ,hollow chrome bar are hot selling products in our company ,any problems pls send us inquiry ,Wish Bos will be your next choice.

Shanghai Bos-Hyd

Att:Mr.Bruce

phone: +86-136 81801718

web: https://www.bos-hyd.com/

Email:

Material section and requirements of hydraulic cylinder barrel最先出现在Bos-Hyd。

Hydraulic Cylinder Tube is also called cylinder barrel, usually used in the hydraulic cylinder of the Heavy Machinery, Cranes, Excavator and Forklifts.etc

E355 En10305-1 DIN2391 ST52 Hydraulic Cylinder Tube

Standard: EN 10305-1

Materials:E355

Technical: cold-drawn seamless

Delivery Condition:BK.BKW,BK+S,GBK,NBK

Straightness: 0.5mm/1m max for tubes below 3m,0.8mm/1m max for tubes between 3 to 6m, 1.2mm/1m for tubes above 6m

Technology:honing & SRB(Skived and Roller Burnished).so it also names as honed tubes or SRB tubes

We design and manufacture seamless hydraulic cylinder tubes using high quality raw materials and state-of-the-art technology to ensure durability and robust performance.we mainly choose raw material from big steel factory, such as TPCO, BAO STEEL, SHA STEEL, which are best and largest raw material manufacturer in China

We provide a large stock of welded tube cylinders for various industries such as agriculture and construction, as well as for waste recovery and OEM.ST52 hydraulic cylinder tube has good machinability and weldability, durability, corrosion resistance, is the world’s customers preferred all sizes and thickness of hydraulic cylinder tube.The cold drawn hydraulic cylinder tubes produced by bos hyd meet or exceed ASTM A519, ASTM A513, EN 10297, EN 10305 and other international standards.

E355 +SR DIN2391 ST52 Hydraulic Cylinder Tube最先出现在Bos-Hyd。

ST52 honed tubes are a type of Low Carbon Manganese Steel. DIN 2391 ST52 Pipe is a readily weldable low carbon manganese steel and also have good impact resistance. Bos Hyd supply all sizes Carbon Steel DIN 2391 Tubes, Carbon Steel DIN 2391 ST52 Pipe and ST52 DIN 2391 Carbon Steel Welded Pipes which are suitable to use in the untreated or normalised condition. The mechanical properties of ST52 Grade Seamless Pipe are similar to mild steel pipe. ST52 Carbon Steel Seamless Tubes are also procured by Construction & welded components for general engineering.

BOS is the largest steel tubes and pipes Manufacturers In China. We produce ST 52 Tube, ST52 steel pipe, ST52 Hydraulic Tube, ST52 Cylinder Honed Tube & HFS Tube ST52. We provide Free quote for all small and large size orders for ST52 Carbon Steel Pipe & ST52 Steel Tube.

Bos-Hyd stock a wide range & wall thickness in ST52 pipe material used for low pressure conveyance of gas, Oil & Gas Pipelines, transportation of water, oil, air steam or other fluids. ST52-3 seamless pipe are very cost effective solution for machinery, buildings construction, irrigation & distribution of high heat, extreme cold & high temperature gases. ST52 Cylinder Honed Tube can be used in water wells.

ST52 Tube Supplier, DIN 2391 ST 52 Welded Pipe Manufacturer in China最先出现在Bos-Hyd。

Cold drawn seamless tube and pipe is a cold drawn 1020/st52 steel tube produced by piercing hot billets and subsequent rolling which reduces their diameter and elongates them. This material is then passed through a die and over a mandrel plug to produce an accurate size and gauge which is the essence of the cold drawing process.Cold drawn seamless tubing provides a better uniformed OD and ID, enhanced machinability, increased strength, and tighter tolerances compared to hot finish seamless products.

Benefits of Cold Drawn Seamless Tubing:

• Superior surface finish
• High yield strength
• Dimensional accuracy and excellent micro-structure uniformity
• Enhanced machinability
• High strength to weight ratio
• Tight tolerances, resulting in reduced machine time
• Possible spiraling eccentricity inherent in product

Bos Hyd is a professional manufacturer in cold drawn seamless steel tube ,we have more than 20 years experience in hydraulic cylinder tubes,besides CDS tubes,we also supply:

Ready to hone tube

ST52 Honed tube

Pre Honed Tubes

Hydraulic Cylinder Barrel

Hydraulic cylinder tube(Honed tube)

Hard chrome plated rod/bar/shaft(Piston rod)

Hydraulic cylinder

Please contact us through below methods for more information.

Email: 
Tel & WhatsApp & Wechat  : +8613681801718

How is cold drawn seamless tube made?最先出现在Bos-Hyd。

SCM440 quenched and tempered steel tube is used extensively in applications for automotive industry, Hydraulic, Mining and oil and gas drilling industry. scm440 Q&T tubes include scm440 Q&T seamless steel pipes and scm440 Q&T drilling hollow bars. scm440 steel pipe has higher strength than 4130 Pipe.

Heat Treated Steel Tube we produce are Round Steel Tubing such as Annealed Tubing, normalized tubing and quenched & tempered Steel Tubing.

SCM440 Q&T steel tube we supply includes following advantages:

Consistent mechanical properties
Even thickness on the whole bars
Deep mechanical properties
Even hardness on the whole bars
Tougher and Increased strength

1. scm440steel equivalent material:

2. scm440steel chemical composition:

3. scm440steel mechanical properties:

SCM440 quenched and tempered steel tube最先出现在Bos-Hyd。

34CrMo4 main Alloy composition is Cr and Mo. 34CrMo4 Steel is a high quality Quenched and Tempered Alloy Structural steel, It belong to the high quality low carbon,Low alloy chromium, molybdenum, nickel case hardening steel. Oil Quenched & Tempered Hardness is 18-22 HRc.
34CrMo4 seamless steel tube has high durable strength and creep strength at high temperature, good impact toughness at low temperature, good hardenability, no tendency to overheat, small quenching deformation, plasticity is fair when cold side shape, medium machinability.  The nearest equivalents are 34CrMo4 in EN10083-3 or 4130 in ASTM A29 with some deviations

Poor weldability, pre-heating before welding, post-welding heat treatment and stress elimination, generally used after quenching and tempering treatment, can also be used after high and medium frequency surface quenching or quenching and low and medium temperature tempering.  

Applicable Standards of 34CrMo4 seamless steel tube

— EN 10083-1 steel for quenching and tempering generaltchnical delivery conditions

— ASTM A370 standard test methods and definitions for mechanical testing of steel products

— JIS G3429 seamless steel tubes as  high pressure cylinder tubes.

— ASTM E112 standard test methods for determining average grain size

— ASTM E45 standard test methods for determining the inclusion content of steel

Test and inspection of 34CrMo4 seamless steel pipe

Chemical composition (Ladle and product analysis)

Tensile test (on heat treated samples)

Impact test (on heat treated samples)

Flattening test (on heat treated samples)

Bending test (on heat treated samples)

Hardness test (on heat treated samples)

Electromagnetic inspection

Our main business range is listed as follows:

Carbon Seamless Steel pipe/tube

Hydraulic cylinder tube(Honed tube)

Hard chrome plated rod/bar/shaft(Piston rod)

Ready to hone tube

ST52 Honed tube

Hydraulic Cylinder Barrel

Applicable Standards of 34CrMo4 seamless steel tube最先出现在Bos-Hyd。

The cold working method of  seamless steel pipe, includes cold rolling and cold drawing method to produce a complete set of equipment for the pipe.

It is a unit for deep processing of hot rolled pipe or welded pipe. The production characteristics of cold-rolled precision steel pipe processing pipe unit is that the pipe material is usually subjected to multiple cold deformations and work hardening from the input to the finished product.

Therefore, the whole production process consists of multiple preparation processes and deformation processes, and has the characteristics of reciprocating cycle. This will involve  many processes, long production cycle, large metal consumption, low production efficiency, high precision, bright and smooth inner and outer surfaces, no peeling, no cracks, no pits.

Different processing methods and corresponding auxiliary processes are selected according to the processing properties of the metal, the pipe size, the quality requirements, and the investment and benefits. The basic processes of cold-rolled precision steel pipe and cold drawn precision steel pipe are as follows:

(1) Pipe material supply, the pipe material used is hot-rolled seamless steel pipe finished pipe or pipe blank semi-finished pipe, extruded pipe and spiral welded steel pipe;
(2) Pipe Preparation of materials, including inspection, bundling, pickling, washing, rinsing, neutralization, drying, and coating of lubricants.
(3) Cold working (cold rolling or cold drawing);
(4) Finishing of finished products including heat treatment of finished products, correction Straight, sampling, cutting head and tail, inspection (manual inspection and various flaw detection), hydraulic test, oiling, packaging, storage, etc. Different product finishing content is different.

Bright precision tube performance 

1. Light weight, high strength, convenient transportation and installation.

The fiber-wound fiber-reinforced FRP pipe has a specific gravity of 1.65-2.0, which is only 1/4 of the steel, but the hoop tensile strength of the precision steel pipe is 180 – 300MPa, and the axial tensile strength is 60 – 15OMPa. alloy steel. Therefore, its specific strength (strength/specific gravity) is 2 to 3 times that of alloy steel. In this way, it can meet the user’s requirements, and is designed to meet all kinds of pipelines that withstand internal and external pressure requirements.

For single weights of the same pipe diameter. The FRP pipe is only 1/2.5 of carbon steel pipe (steel coiled pipe), 1/3.5 of cast iron pipe, and about 1/8 of pre-stressed reinforced concrete pipe, so transportation and installation are very convenient. The precision steel pipe has a length of 12 meters per section, which can reduce the joint of the concrete pipe by two-thirds. Its socket connection method makes installation quick and easy, and reduces the lifting cost and improves the installation speed.

2. Anti-fouling and anti-mite

The surface of the unsaturated polyester resin is clean and smooth, and will not be contaminated by microorganisms such as shellfish and fungi in the marine or sewage, so that the roughness is increased, the cross section of the water is reduced, and the maintenance cost is increased.

The precision steel pipeline has no such pollution, and the long-term use is as clean as ever. At the same time, due to its smooth inner wall and excellent corrosion resistance, it does not produce scale and microbial growth, effectively guarantees water quality and maintains water resistance stability. However, the traditional pipe has the phenomenon of increasing water resistance and surface fouling in the future.

3. Heat resistance

At a temperature of minus 30 °C, it still has good toughness and high strength. It can be used for a long time in the range of minus 50 °C to 80 °C. The specially formulated resin can also work at temperatures above 110 °C.

Bos Hyd specialized in manufacturing cold drawn seamless steel pipe, we have more than 23 years experience in manufacturing, we also supply honed cylinder tube and chrome piston rod, any needs please contact us.

Cold working method for cold drawn seamless steel pipe最先出现在Bos-Hyd。

EN 10305-1 E355 FE510 Seamless Steel Honed Tubes are characterized by having precisely defined tolerances on dimensions and a specified surface roughness. Typical fields of application are in the vehicle, furniture and general engineering industries.

Honing is a kind of machining technology. Through honing head, the inner hole of cold drawn pipe is processed by reciprocating high-speed grinding technology, so that the inner hole can meet the requirements of tolerance size and surface roughness that we need.

Seamless steel Honed tube is a kind of smooth bore steel tube used to manufacture hydraulic cylinder barrels that is the core part  of hydraulic cylinder.Our Bos-Hyd has been engaged in produce honed tube ,pre-honed pipe,cylinder honed pipe ,skived and roller burnished tube for more than 20 years.

Available steel grade: 

Manufacture method: Cold rolled, hydraulic cold drawn, hot rolled+deep hole boring

Delivery condition: 

EN 10305-1 E355 FE510 Seamless Steel Honed Tube最先出现在Bos-Hyd。

In order to make the production efficiency of ST52 electroplating honing pipe high, we have adopted a new production process, which is produced by grinding and automatic grinding. Among them, automated grinding includes the use of electric or ultrasonic grinding to complete production tasks.

The daily working principle of the ST52 electroplating honing pipe is mainly the pressure generated by the sand on the belt, and the surface grinding under the rotation speed. After the upper and lower movement of the abrasive belt, the upper and lower surfaces of the workpiece are grounded back and forth to achieve the effect. Of course, in the grinding process, it is necessary to continuously add lubricating oil and perform cooling, which cannot affect the processing quality of the workpiece.

Bos-Hyd is a professional manufacturer in producing ST52 honed tube, besides this, we also produce and supply induction hardened chrome plated cylinder rods.4140hard chrome rod,hydraulic cylinder barrel,hollow chrome bar.

Want to buy honed tube or chrome plate rods?

Please contact us through below methods.

Email:  

Production process of ST52 chrome plated honed tube最先出现在Bos-Hyd。

High precision cold drawn tube is a new high-tech energy-saving product. In recent years, using this technology to produce precision steel tube has been widely used in domestic hydraulic, pneumatic cylinder, coal mine support (prop), oil pump pipe, Jack and other manufacturing fields. Precision cold-drawn steel pipes with high precision promote the use of steel, improve processing efficiency, save energy, reduce investment in hydraulic cylinders and cylinder processing equipment is important.

Cold drawing method: Comparing with the traditional cutting technology, the production of high precision cold drawing pipe-hydraulic cylinder has the following characteristics:
(1) High production efficiency: The traditional method of producing cylinders with diameter of 420 mm and length of 12 meters is 154 hours, and the cold drawing method only takes 4 minutes to produce.
(2) Real high speed: Boring of the boring head and play a guiding role in the cutting process, billet tube due to self-weight deviation, resulting in the deviation of the roller and boring tool, resulting in waste. The rate of authentic products can only reach about 60%, while the rate of authentic products can reach more than 95% in cold drawing production.
(3) High metal utilization rate: traditional boring cylinder manufacturing method, metal utilization rate is only 50-70%. By wire drawing, the metal can not only cut into iron, but also extend by 30%. The utilization rate of metal is up to 95%.
(4) Improving the mechanical properties of cold drawn finished tubes: The plastic deformation of billet is more than 30% by wire drawing method, and the hardening and processing strength limit of finished tubes are greatly improved. Generally, the strength limit of finished tube is increased by 60%.

High precision cold drawn tube is mainly used to produce hydraulic cylinder barrel. The inner hole is smooth after cold drawn and honing process, so the cold drawn pipe can also be called pre-honed tube and ready to honed tube.  

Process of high precision cold drawn tube最先出现在Bos-Hyd。